In case of sea urchin (Strongylocentrotus purpuratus), the acrosome reaction is initiated by_____

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#Question id: 15738

#Unit 5. Developmental Biology

In humans and many other mammals, the sex chromosomes are called:

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#Question id: 11834

#Unit 6. System Physiology – Plant

Hook formation and maintenance result from ethylene-induced asymmetric growth,  indicating that phytochrome is the photoreceptor involved in this process

a) Red light induces hook folding, and far-red light reverses the effect of red

b) close interaction between phytochrome and ethylene controls hook opening

c) Red light inhibits ethylene formation, promoting growth on the inner side, thereby causing the hook to open

Which of the following combination from the given statements is correct?

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#Question id: 10767

#Unit 8. Inheritance Biology

Chi square test is used to verify

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#Question id: 13088

#Unit 13. Methods in Biology

To express a yeast gene in E. coli, your task is to design a strategy to insert the yeast gene into the bacterial plasmid. Below is a map of the area of the yeast genome surrounding the gene in which you are interested.

 

The distance between each tick mark placed on the line above is 100 bases in length

Below are the enzymes you can use, with their specific cut sites shown 5’-XXXXXX-3’ 3’-XXXXXX-5’

 

The plasmid is 5,000 bases long and the two farthest restriction enzyme sites are 200 bases apart. The plasmid has an ampicillin resistance gene somewhere on the plasmid distal from the restriction cut sites.

                              

You do the digestion of the insert and the vector and then ligate the two digestions together. You then transform the ligation into bacteria and select for ampicillin resistance. You get three colonies on your transformation plate. You isolate plasmid from each one and cut each plasmid with the enzyme XbaI. You then run your three digestions on an agarose gel and see the following patterns of bands. Describe what each plasmid actually was that was contained in each of the three colonies.

 

What is the Colony 1’s plasmid is;

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#Question id: 19686

#Unit 13. Methods in Biology

Where is atrial repolarization hidden in the ECG?